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Kikuchi A, Okamura N, Hasegawa T, Harada R, Watanuki S, Funaki Y, Hiraoka K, Baba T, Sugeno N, Oshima R, Yoshida S, Kobayashi J, Ezura M, Kobayashi M, Tano O, Mugikura S, Iwata R, Ishiki A, Furukawa K, Arai H, Furumoto S, Tashiro M, Yanai K, Kudo Y, Takeda A, Aoki M. In vivo visualization of tau deposits in corticobasal syndrome by 18F-THK5351 PET. Neurology 2016; 87:2309-2316. [PMID: 27794115 DOI: 10.1212/wnl.0000000000003375] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 08/22/2016] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To determine whether 18F-THK5351 PET can be used to visualize tau deposits in brain lesions in live patients with corticobasal syndrome (CBS). METHODS We evaluated the in vitro binding of 3H-THK5351 in postmortem brain tissues from a patient with corticobasal degeneration (CBD). In clinical PET studies, 18F-THK5351 retention in 5 patients with CBS was compared to that in 8 age-matched normal controls and 8 patients with Alzheimer disease (AD). RESULTS 3H-THK5351 was able to bind to tau deposits in the postmortem brain with CBD. In clinical PET studies, the 5 patients with CBS showed significantly higher 18F-THK5351 retention in the frontal, parietal, and globus pallidus than the 8 age-matched normal controls and patients with AD. Higher 18F-THK5351 retention was observed contralaterally to the side associated with greater cortical dysfunction and parkinsonism. CONCLUSIONS 18F-THK5351 PET demonstrated high tracer signal in sites susceptible to tau deposition in patients with CBS. 18F-THK5351 should be considered as a promising candidate radiotracer for the in vivo imaging of tau deposits in CBS.
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Affiliation(s)
- Akio Kikuchi
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan.
| | - Nobuyuki Okamura
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan.
| | - Takafumi Hasegawa
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Ryuichi Harada
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Shoichi Watanuki
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Yoshihito Funaki
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Kotaro Hiraoka
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Toru Baba
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Naoto Sugeno
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Ryuji Oshima
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Shun Yoshida
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Junpei Kobayashi
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Michinori Ezura
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Michiko Kobayashi
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Ohito Tano
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Shunji Mugikura
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Ren Iwata
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Aiko Ishiki
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Katsutoshi Furukawa
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Hiroyuki Arai
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Shozo Furumoto
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Manabu Tashiro
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Kazuhiko Yanai
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Yukitsuka Kudo
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Atsushi Takeda
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - Masashi Aoki
- From the Departments of Neurology (A.K., T.H., T.B., N.S., R.O., S.Y., J.K., M.E., M.A.), Pharmacology (N.O., R.H., K.Y.), and Diagnostic Radiology (S.M.), Tohoku University Graduate School of Medicine; Divisions of Cyclotron Nuclear Medicine (S.W., K.H., M.T.) and Radiopharmaceutical Chemistry (Y.F., R.I., S.F.), Cyclotron and Radioisotope Center, and Department of Geriatric and Respiratory Medicine (A.I., K.F., H.A.) and Division of Neuroimaging (Y.K.), Institute of Development, Aging and Cancer, Tohoku University; Department of Neurology (M.K.), Tohoku Pharmaceutical University Hospital; Department of Neurology (O.T.), Sendai Medical Center; and Department of Neurology (A.T.), National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
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